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In Germany, PSE is available exclusively as a combination product with other active ingredients such as acetylsalicylic acid, paracetamol, ibuprofen, and first- and second-generation H1 receptor antagonists. Despite the widespread availability and frequent use of PSE, the active ingredient has repeatedly been linked to serious adverse drug reactions (ADRs). Most recently, in 2024, a red-hand letter was circulated after a link was established between PSE use and the occurrence of cerebral hypoperfusion. Furthermore, the drug is not always used in accordance with guidelines for treating specific symptoms but is also misused due to its indirect sympathomimetic effect. This study includes an analysis of published PSE intoxication cases from the literature. To this end, a systematic literature search was conducted in PubMed, from which 118 patient cases were extracted from a total of 81 case reports. The individual cases were then analyzed with regard to various aspects. The United States was the leading country in terms of case reports, followed by the United Kingdom. The analyzed patient cases show differences in terms sex and symptoms. Cardiovascular events occurred predominantly in men, while gastroenterological and dermatological symptoms occurred predominantly in women. To reduce the risk of PSE poisoning, increased educational efforts by physicians and pharmacists are necessary. Furthermore, checking for contraindications could reduce the risk. Education about PSE could also be provided through reputable online platforms. This study highlights the clinical relevance of PSE poisoning and the wide range of symptoms.<\/jats:p>","DOI":"10.1007\/s00210-026-05941-2","type":"journal-article","created":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T05:26:25Z","timestamp":1790573185000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Pseudoephedrine intoxication: sex-specific differences in clinical symptoms"],"prefix":"10.1007","author":[{"given":"Funda","family":"Gezgin","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roland","family":"Seifert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,9,28]]},"reference":[{"issue":"2","key":"5941_CR1","doi-asserted-by":"publisher","first-page":"387","DOI":"10.3980\/j.issn.2222-3959.2014.02.35","volume":"7","author":"EY Ah-Kee","year":"2014","unstructured":"Ah-Kee EY, Li Yim JF (2014) Bilateral acute angle closure glaucoma precipitated by over the counter oral decongestant. 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The Hannover Medical School follows the guidelines of the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG).\n                      Translated with DeepL.com.","order":2,"name":"Ethics","label":"Ethics approval","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"R.S. is the Editor-in-Chief of Naunyn-Schmiedebergs Archives of Pharmacology and follows the editorial guidelines of editors acting as author (\n                      \n                      ).","order":3,"name":"Ethics","label":"Competing interests","group":{"name":"EthicsHeading","label":"Declarations"}}]}}